ref: b3d38369742cb8d06a88a6a4ba92e14f97038407
dir: /home/joypad.asm/
ReadJoypad:: ; Poll joypad input. ; Unlike the hardware register, button ; presses are indicated by a set bit. ld a, 1 << 5 ; select direction keys ld c, 0 ld [rJOYP], a rept 6 ld a, [rJOYP] endr cpl and %1111 swap a ld b, a ld a, 1 << 4 ; select button keys ld [rJOYP], a rept 10 ld a, [rJOYP] endr cpl and %1111 or b ld [hJoyInput], a ld a, 1 << 4 + 1 << 5 ; deselect keys ld [rJOYP], a ret Joypad:: ; Update the joypad state variables: ; [hJoyReleased] keys released since last time ; [hJoyPressed] keys pressed since last time ; [hJoyHeld] currently pressed keys homecall _Joypad ret